null 객체 참조에서 가상 메소드 'void android.opengl.GLSurfaceView $ GLThread.surfaceCreated()'를 호출하려고 시도했습니다.

Question

저는 Google Cardboard를 처음 사용하여 이것을 구현하려고 시도했지만 example입니다. .aar 파일을 올바르게 포함 시켰으며 실행시이 런타임 예외가 발견되었습니다. 이 문제를 해결하는 방법을 제안하고 가능하면 데모가있는 Google 골판지의 기본 시작 위치를 제안하십시오.

이 주제에 관해 저에게 도움을 주신 것에 진심으로 감사드립니다.

import android.content.Context; 
import android.content.Intent; 
import android.net.Uri; 
import android.os.Bundle; 
import android.os.Vibrator; 
import android.util.Log; 
import android.widget.ImageView; 

import com.google.vr.sdk.base.Eye; 
import com.google.vr.sdk.base.GvrActivity; 
import com.google.vr.sdk.base.GvrView; 
import com.google.vr.sdk.base.HeadTransform; 
import com.google.vr.sdk.base.Viewport; 

import javax.microedition.khronos.egl.EGLConfig; 

public class MainActivity extends GvrActivity implements 
     GvrView.StereoRenderer { 

    private static final String TAG = "MainActivity2"; 

    Uri fileUri = null; 
    ImageView photoImage = null; 

    private Vibrator mVibrator; 

    private int mScore = 0; 

    private CardboardOverlayView mOverlayView; 

    public MainActivity() { 
    } 

    /** 
    * Sets the view to our CardboardView and initializes the transformation 
    * matrices we will use to render our scene. //@param savedInstanceState 
    */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 

     setContentView(R.layout.content_main); 

     GvrView cardboardView = (GvrView) findViewById(R.id.cardboard_view1); 

     setGvrView(cardboardView); 

     mVibrator = (Vibrator) getSystemService(Context.VIBRATOR_SERVICE); 

     mOverlayView = (CardboardOverlayView) findViewById(R.id.overlay); 

     mOverlayView.show3DSplashImage(); 

     mOverlayView.show3DImage(mScore++, MainActivity.this); 
     mVibrator.vibrate(50); 


    } 

    protected void onNfcIntent(Intent intent) { 

    } 

    @Override 
    public void onRendererShutdown() { 
     Log.i(TAG, "onRendererShutdown"); 
    } 

    @Override 
    public void onSurfaceChanged(int width, int height) { 
     Log.i(TAG, "onSurfaceChanged"); 
    } 

    @Override 
    public void onSurfaceCreated(EGLConfig eglConfig) { 
     Log.i(TAG, "onSurfaceCreated"); 
    } 


    /** 
    * Creates the buffers we use to store information about the 3D world. 
    * OpenGL doesn't use Java arrays, but rather needs data in a format it can 
    * understand. Hence we use ByteBuffers. 
    * 
    * @param config 
    *   The EGL configuration used when creating the surface. 
    */ 


    /*@Override 
    public void onCardboardTrigger() { 
     Log.i(TAG, "onRendererShutdown1"); 

     mOverlayView.show3DImage(mScore++, MainActivity.this); 
     mVibrator.vibrate(50); 
    }*/ 

    /** 
    * Prepares OpenGL ES before we draw a frame. 
    * 
    * @param headTransform 
    *   The head transformation in the new frame. 
    */ 
    @Override 
    public void onNewFrame(HeadTransform headTransform) { 
    } 

    @Override 
    public void onDrawEye(Eye eye) { 

    } 

    /** 
    * Draws a frame for an eye. The transformation for that eye (from the 
    * camera) is passed in as a parameter. 
    * 
    * @param viewport 
    *   The transformations to apply to render this eye. 
    */ 


    @Override 
    public void onFinishFrame(Viewport viewport) { 
    } 

    public void onRemovedFromCardboard() { 
     Log.d("vbv", "msg"); 
    } 
} 

CardboardOverlayView.java

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.opengl.GLSurfaceView$GLThread.surfaceCreated()' on a null object reference 
                  at android.opengl.GLSurfaceView.surfaceCreated(GLSurfaceView.java:556) 
                  at android.view.SurfaceView.updateWindow(SurfaceView.java:675) 
                  at android.view.SurfaceView$3.onPreDraw(SurfaceView.java:202) 
                  at android.view.ViewTreeObserver.dispatchOnPreDraw(ViewTreeObserver.java:944) 
                  at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2357) 
                  at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1301) 
                  at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6673) 
                  at android.view.Choreographer$CallbackRecord.run(Choreographer.java:800) 
                  at android.view.Choreographer.doCallbacks(Choreographer.java:603) 
                  at android.view.Choreographer.doFrame(Choreographer.java:572) 
                  at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:786) 
                  at android.os.Handler.handleCallback(Handler.java:815) 
                  at android.os.Handler.dispatchMessage(Handler.java:104) 
                  at android.os.Looper.loop(Looper.java:194) 
                  at android.app.ActivityThread.main(ActivityThread.java:5637) 
                  at java.lang.reflect.Method.invoke(Native Method) 
                  at java.lang.reflect.Method.invoke(Method.java:372) 
                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:959) 
                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:754) 

MainActivity.java 선형 레이아웃 extented 클래스입니다.

Answer 1

내가 잃어버린 그

GvrView cardboardView = (GvrView) findViewById(R.id.cardboard_view1); 

     cardboardView.setRenderer(this);